Istanbul is Turkey's largest city.

Istanbul may also refer to:

• Istanbul (film), a 1957 American drama
• Istanbul, a 1985 Belgian film by Marc Didden

• Istanbul (board game)

• Istanbul (novel), a novel in the Killmaster series
• Istanbul: Memories and the City, a memoir by Orhan Pamuk

• "Istanbul" (Morrissey song) (2014)
• "Istanbul (Not Constantinople)", a swing-style song with lyrics by Jimmy Kennedy and music by Nat Simon
• Istanbul cymbals, two Turkish instrument brands
  • Istanbul Agop Cymbals
• "Instanbul", song by Jay Chou from the 2000 album Jay
• "İstanbul", a 2016 instrumental track by REVen-G

• Istanbul Technical University, an international technical university founded in 1773
• Istanbul University, a university in Turkey

• Greater Istanbul
• Historic Areas of Istanbul
• Istanbul Province
• Istanbul Square, Lahore, Pakistan
• Istanbul Vilayet, a historical administrative division in the Ottoman Empire

• İstanbul Büyükşehir Belediyespor (football team), a football club owned by the Municipality of Istanbul
• İstanbul Büyükşehir Belediyesi (volleyball team), a volleyball club owned by the Municipality of Istanbul
• İstanbul Büyükşehir Belediyesi S.K., a multi-sports club of the metropolitan municipality of Istanbul
• Istanbul Cavaliers, an American football team in Turkey founded in 2005
• İstanbul Güngörenspor, a football club founded in 1983
• Istanbul Maltepespor, a football club founded in 1923
• İstanbul Ottomans, the first ever Turkish rugby union team established in 1999
• Istanbul Paten Kulübü, an ice hockey sports club established 1987
• İstanbul Teknik Üniversitesi B.K., a basketball team of the Istanbul Technical University

• Canal Istanbul, an artificial waterway project
• İstanbul Haydarpaşa Terminal, terminus railway station at the Asian part of Istanbul
• Istanbul Hezarfen Airfield, an airport for general aviation located in the Çatalca district of Istanbul
• Istanbul LRT, a light metro system at the European part of Istanbul
• Istanbul Monorail, a cancelled monorail system in Istanbul
• Istanbul Metro, mass-transit underground railway network
• Istanbul Sirkeci Terminal, terminus railway station at the European part of Istanbul

• Apostolic Vicariate of Istanbul, a Roman Catholic apostolic vicariate based in Istanbul, Turkey
• Armenian Catholic Archeparchy of Istanbul, also known as Armenian Catholic Archdiocese of Constantinople, serves Armenian Catholics in Turkey under the Armenian Catholic Patriarch of Cilicia

• Declaration of Istanbul, a declaration providing ethical guidelines for practice in organ donation and transplantation
• Istanbul Stock Exchange, a corporation in Turkey for securities exchange

• Byzantium (disambiguation)
• Constantinople (disambiguation)
• Istanbul Airport (disambiguation)
• Istanbul bombings (disambiguation)
• Istanbul Summit (disambiguation)
• Treaty of İstanbul (disambiguation)